CI: fix github treating bools as strings in ci yml

.github/workflows/ci.yml

@@ -33,25 +33,25 @@ jobs:
       - name: Set up Docker Label
         id: docker-label
         run: |
-          if [ ${{ steps.changes.outputs.docker && github.event_name != 'push' }} = "true" ]; then
+          if [ ${{ steps.changes.outputs.docker == 'true' && github.event_name != 'push' }} = "true" ]; then
             echo "label=ghcr.io/fair-acc/gr4-build-container:$GITHUB_HEAD_REF" >> "$GITHUB_OUTPUT"
           else
             echo "label=ghcr.io/fair-acc/gr4-build-container:latest" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Set up Docker Buildx
-        if: steps.changes.outputs.docker
+        if: steps.changes.outputs.docker == 'true'
         uses: docker/setup-buildx-action@v3
 
       - uses: docker/login-action@v3
-        if: steps.changes.outputs.docker
+        if: steps.changes.outputs.docker == 'true'
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - uses: docker/build-push-action@v5
-        if: steps.changes.outputs.docker
+        if: steps.changes.outputs.docker == 'true'
         with:
           context: "{{defaultContext}}:docker"
           push: true